Abstract
THE colour of the light which is emitted from the capillary of a vacuum tube containing pure hydrogen is the familiar vivid, deep pink, the prevailing tint being due to the predominating brilliance of the red line (Hα). When the same capillary is viewed from one end, however, the colour is a very pale pink, indeed, nearly white.
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RAFFETY, C. The Hydrogen Spectrum. Nature 86, 12 (1911). https://doi.org/10.1038/086012c0
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DOI: https://doi.org/10.1038/086012c0
